Your company has a subscription to Office 365 for midsize business and enterprises. The company uses Microsoft Lync Online.
You need to open ports on the network firewall to enable all of the features of Lync Online.
Which port or ports should you open? (Each correct answer presents part of the solution. Choose all that apply.)

A.
inbound TCP 443

B.
outbound TCP 5061

C.
outbound UDP 3478

D.
outbound TCP 443

E.
outbound UDP 50000 to outbound UDP 59999

F.
inbound TCP 8080

Explanation:
https://ahandyblog.wordpress.com/cloud-technologies/firewall-ports-for-office-365/